Originally Posted by
Frank Petronio
It also depends on your eyesite and what your ground glass/fresnel situation is. With a bright fresnel a lower magnification loupe usually is best because under high magnification the texture of the fresnel will be distracting. Same with the brighter but coarser ground glasses. But if you have a plain ground glass, finely ground, then a higher mag loupe is nicer to use and you can see precise focus easier, even if things are dimmer.
Same thing with 35mm SLRs, as the focusing screens got brighter, manual focusing actually seemed harder since the image didn't "pop" into focus like before.
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